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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b876116aaef1652048db36cf5cd572d1805065a7c66795c8995893b739a9fc' 
  AND token = 'N17Ziv4V3BegwWIVJn9xWHakf+ISMDVbLefYK0DsAME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}